Anatomy and Variations of the Lip
The lips are two flaps surrounding the oral orifice. As they are located at the entrance to the digestive tract, the external surface is covered with skin and the internal surface with mucosa. Externally, the appearance of the lip can vary because of syndromes affecting the face. Lip shape is usually defined by the shape of the philtrum. The lateral border of the lip and the nasolabial fold differ among individuals in shape and length. Internally, the labial salivary glands can be affected by disease and aging. The muscles in the lips can also be altered by certain diseases. In this chapter, we describe the anatomy and variations of the lip.
- Ethunandan MG (2016) Chapter 9: Oral cavity. In: Brennan PA, Mahadevan V, Evans BT (eds) Clinical head and neck anatomy for surgeons. CRC Press, Boca Raton, pp 77–80Google Scholar
- Fara M (1990) Chapter 51. The musculature of cleft lip and palate. In: JG MC (ed) Plastic surgery general principles, vol 1. WB Saunders Co, Philadelphia, pp 2598–2612Google Scholar
- Gleeson M (2016) Chapter 31. Oral cavity. In: Standring S (ed) Gray’s anatomy, 41st edn. Elsevier, Amsterdam, pp 507–508Google Scholar
- Iwanaga J, Watanabe K, Schmidt CK et al (2017a) Anatomical study and comprehensive review of the incisivus labii superioris muscle: application to lip and cosmetic surgery. Cureus 15:e1689Google Scholar
- William R (2015) Chapter 2.13. Abnormalities of the Philtrum. In: The bedside dysmorphologist. Oxford University Press, Oxford, pp 48–51Google Scholar